Domino reaction of arylaldehydes and 1-acetylcyclopropanecarboxamides: one-pot access to highly functionalized spiropiperidine-2,4-diones
摘要:
A domino reaction based on arylaldehydes and 1-acetylcyclopropanecarboxamides has been developed, which allows one-pot and efficient synthesis of structurally complex piperidine-2,4-diones with multiple functionalities under mild conditions. The overall transformation involves tandem aldol/intramolecular aza-Michael/(aldol)/Michael sequences. (C) 2010 Elsevier Ltd. All rights reserved.
Catalyst-Free Domino Reaction of 1-Acryloyl-1-N-arylcarbamylcyclopropanes with Amines: One-Pot Approach to 2,3,6,7-Tetrahydro-1H-pyrrolo[3,2-c]pyridin-4(5H)-ones
摘要:
AbstractA facile one‐pot, catalyst‐free reaction has been developed for the synthesis of 2,3,6,7‐tetrahydro‐1H‐pyrrolo[3,2‐c]pyridin‐4(5H)‐ones from readily available 1‐acryloyl‐1‐N‐arylcarbamylcyclopropanes and amines using a domino ring‐opening/cyclization/aza‐addition sequence. magnified image
We report here that a series of bridged O,O-ketal fusedspiro piperidone-cyclopropane derivatives 3 can be constructed with excellent yields and good diastereoselectivity by the one-pot reaction of 1-acylcyclopropanecarboxamides 1 with electron-deficient alkene 2a (EWG = CHO) via the domino process involving [4 + 2] annulation/intermolecular electrophilic addition/intramolecular cyclization. Furthermore
Aza−Oxy−Carbanion Relay via Non-Brook Rearrangement: Efficient Synthesis of Furo[3,2-<i>c</i>]pyridinones
作者:Fushun Liang、Shaoxia Lin、Ying Wei
DOI:10.1021/ja110870f
日期:2011.2.16
An aza-oxy-carbanion relay via tandem Michael addition/ring opening of cyclopropane and recyclization/carbanion migration/electrophile trapping has been developed by the utilization of 1-cinnamoylcyclopropanecarboxamides to react with various electrophiles. This represents the first example of anion relay chemistry via non-Brook rearrangement. This novel protocol has been applied in the facile and